Dilaudid is a powerful opioid painkiller that is used to treat severe pain. It can be addictive, so it is important to use it only as prescribed by your doctor. Dilaudid can be purchased online without a prescription, but this is not recommended. Buying prescription drugs online can be dangerous, as you may not be getting the real drug and you may not be getting the correct dosage. If you are considering buying Dilaudid online, talk to your doctor first.